Contractual interest rate for funds borrowed, under the debt agreement.

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Long-term Debt (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Debt Instrument [Line Items]
Principal amount	$ 2,895,095		$ 3,096,229
Loss on extinguishment of debt	$ (2,908)	$ 0
4.75% Notes due December 2022
Debt Instrument [Line Items]
Interest rate	4.75%
Senior Notes \| 4.75% Notes due December 2022
Debt Instrument [Line Items]
Interest rate	4.75%
Principal amount redeemed	$ 200,000
Principal amount	600,000
Loss on extinguishment of debt	$ (2,900)